README.md in embulk-output-oracle-0.2.2 vs README.md in embulk-output-oracle-0.2.3

@@ -60,8 +60,51 @@
 
 ```
 $ ./gradlew gem
 ```
 
-For Windows(x64), you can build cpp library by "src/main/cpp/win/build.bat".
+#### Build environment for native library
 
-For Linux, you can build cpp library by "src/main/cpp/linux/build.sh".
+For Windows (x64)
+
+(1) Install JDK.
+
+(2) Install Microsoft Visual Studio (only 2010 is tested).
+
+(3) Install Oracle Instant Client SDK 11.1.0.6.0 for Microsoft Windows (x64).
+
+(4) Set environment variables.
+
+* JAVA_HOME
+* OCI\_SDK_PATH ("sdk" directory of Oracle Instant Client)
+
+(5) Open src/main/cpp/win/embulk-output-oracle.sln by Visual Studio and build.
+
+For Windows command line, the following are needed in addition to (1) - (4).
+
+(6) Set environment variables.
+
+* MSVC_PATH (ex. C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC)
+* MSSDK_PATH (ex. C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A)
+
+(7) Execute src/main/cpp/win/build.bat .
+
+
+For Linux (x64) (only Ubuntu Server 14.04 is tested)
+
+(1) Install JDK.
+
+(2) Install gcc and g++ .
+
+(3) Install Oracle Instant Client Basic and SDK 11.1.0.6.0 for Linux (x64).
+
+(4) Create symbolic links of OCI libraries.
+
+    ln -s libocci.so.11.1 libocci.so
+    ln -s libclntsh.so.11.1 libclntsh.so
+
+(5) Set environment variables.
+
+* JAVA_HOME
+* OCI_PATH (the directory of Oracle Instant Client Basic and the parent of the "sdk" directory)
+
+(6) Execute src/main/cpp/linux/build.sh .